Einflussfaktoren auf die Trächtigkeitsrate in der deutschen Vollblutzucht

Ewert, M.; Böröcz, Jozsef; Uphaus, Hubert; Oldenhof, Harriëtte; Distl, O.; Sieme, Harald

doi:10.1055/s-0038-1623164

Cited by 2 publications

(5 citation statements)

References 18 publications

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“…Conception rates were highest in the months April, May and June. Similar results have been obtained for Thoroughbred mares in Sweden [ 18 ] and Germany [ 16 ]. Mares foaling later in the season have less usable cycles to get pregnant again [ 7 ].…”

Section: Discussionsupporting

confidence: 87%

“…The coldblooded horses Breton, Comtois, Ardenne, Percheron and Boulonnais in France had lower seasonal foaling rates than French warmblood or Thoroughbred mares [ 7 ], and the coldblooded Finnhorses achieved lower seasonal foaling rates than the Finnish Standardbred [ 9 ]. Studies of Thoroughbreds indicated foaling rates of 43–57% per cycle [ 12 , 13 ] and 52–78% per season [ 11 – 13 , 16 , 18 , 19 , 24 , 26 – 28 ]. In Standardbreds, foaling rates were 29–58% per cycle [ 5 ] and 50–76% per season [ 5 , 9 , 22 ].…”

Section: Discussionmentioning

confidence: 99%

“…The mares showed a constant decline in CFR with higher ages which is not in agreement with previous reports. A significant decline of fertility measures became mostly evident in middle-aged mares [ 12 , 13 , 16 , 18 , 22 , 27 ] from 9 to 14 years. The reason for declining reproductive productivity in mares aged > 9 to14 years might be progressive degenerative changes in the endometrium and increasing susceptibility to infection [ 33 , 34 ].…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, no effect on foaling rates had been shown in Thoroughbreds and Icelandic horses [ 14 , 24 ]. Ewert et al [ 16 ] observed a decrease of pregnancy rates for matings with Thoroughbred stallions > 16 years of age. Langlois and Blouin [ 7 ] pointed out that stallions can only be used up to an age of 20 years if their yearly number of mated mares is limited progressively.…”

Section: Discussionmentioning

confidence: 99%

“…Mares foaling later in the season have less usable cycles to get pregnant again [ 7 ]. In addition, the accumulation of subfertile mares that were covered repeatedly without success has a negative effect on fertility at the end of the breeding season as well [ 16 , 17 , 26 ].…”

Section: Discussionmentioning

confidence: 99%

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Effects of inbreeding and other systematic effects on fertility of Black Forest Draught horses in Germany

2017

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BackgroundThe Black Forest Draught horse (BFDH) is an endangered German coldblood breed with its origin in the area of the Black Forest in South Germany. In this retrospective study, the influence of the inbreeding coefficient on foaling rates was investigated using records from ten breeding seasons. Due to the small population size of BFDH, the level of inbreeding is increasing and may have an effect on foaling rates.The data of the present study included all coverings reported for 1024 BFDH mares in the years 2001–2009. These mares were covered by 32 BFDH stallions from the State Stud Marbach. Data from 4534 estrus cycles was used to calculate per cycle foaling rate (CFR). Pedigree data contained all studbook data up to the foundation of the breed as early as 1836. The level of inbreeding of the mare, stallion and expected foal along with other systematic effects on CFR were analysed using a generalized linear mixed model approach. Stallion was employed as a random effect. Systematic fixed effects were month of mating, mating type, age of the mare and stallion, reproductive status of the mare and stallion line of the mare. Inbreeding coefficients of the stallion, mare and expected foal were modelled as linear covariates.ResultsThe average CFR was 40.9%. The mean inbreeding coefficients of the mares, stallions and expected foals were 7.46, 7.70 and 9.66%. Mating type, age of the mare, reproductive status of the mare and stallion line of the mare had a significant effect.ConclusionsThe results showed that the mating type, stallion line of the mare, sire, age and reproductive status of the mare exerted the largest influences on CFR in BFDH. Inbreeding coefficients of the stallion, mare and expected foal were not significantly related with CFR.Electronic supplementary materialThe online version of this article (doi:10.1186/s13028-017-0338-4) contains supplementary material, which is available to authorized users.

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Section: Discussionsupporting

confidence: 87%